BUG 11835: assignment rules after upgrade to 2.0.46

Sol: changing SELF_SERVICE to SELF_SERVICE_EVALUATE in case the new option has been selected. schema.xml got a new validation value.
BUG 11835 : ./workflow/engine/config/schema.xml
SOl: Set the default TAS_GROUP_VARIABLE to "" and set TAS_GROUP_VARIABLE to @@SYS_GROUP_TO_BE_ASSIGNED in php code
Merge remote-tracking branch 'upstream/master'
BUG 11835 : Assignment rules after upgrade to 2.0.46
Sol: Adding patch for next versions usign SELF_SERVICE.
BUG 11835 : Assignment rules after upgrade to 2.0.46
Sol: Adding patch for next PM versions using SELF_SERVICE. Plus checking Version to set the patch.
Merge branch 'master' of github.com:ralpheav/processmaker
BUG 11835 : Assignment rules after upgrade to 2.0.46
Sol: Adding patch for next PM versions using SELF_SERVICE.
Plus checking Version to set the patch.
Merge branch 'master' of github.com:ralpheav/processmaker
Merge pull request #1785 from ralpheav/master

BUG 11835 : Assignment rules after upgrade to 2.0.46